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第1题

Some of the middle-aged people ____ to the meeting were famous professors. A. were invited B. who invited C. inviti
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第2题

It was dark and cold. They had to find a house ____ and some wood ____. "A. to stay in…to make a fire with B. to sta
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第3题

如果一台微机有两个文件同名，主要不在同一个目录，则认为是两个文件。（） A、正确 B、错误
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第4题

螯合物比一般配合物稳定性大。
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